首先看一下如何獲得request對象、session對象：
普通的Controller類，示例代碼如下：
@Controller @RequestMapping(value = "user") public class UserController { @RequestMapping(value = "/reg2") public String reg2(String uname,HttpServletRequest req,ModelMap map){ req.setAttribute("a", "aa"); req.getSession().setAttribute("b", "bb"); return "index"; } }
ModelMap:
是map的實現，可以在其中存放屬性，作用域同request。下面這個示例，我們可以在modelMap中放入數據，然后在forward的頁面上顯示這些數據。
通過el表達式、JSTL、java代碼均可。
代碼如下：
package com.sxt.web; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.mvc.multiaction.MultiActionController; @Controller @RequestMapping(value = "user") public class UserController extends MultiActionController { @RequestMapping(value = "/reg") public String reg(String uname,ModelMap map){ map.put("a", "aaa"); return "index"; } }
JSP頁面：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head></head> <body> <h1>${requestScope.a}</h1> <c:out value="${requestScope.a}"></c:out> </body> </html>
請求轉發和重定向：
package com.sxt.web; import javax.annotation.Resource; import org.springframework.stereotype.Controller; import org.springframework.ui.ModelMap; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.SessionAttributes; @Controller @RequestMapping(value = "user") public class UserController { @RequestMapping(value = "/reg4") public String reg4(ModelMap map) { System.out.println("HelloController.handleRequest()"); // return "forward:index.jsp"; // return "forward:user.do?method=reg5"; //轉發 // return "redirect:user.do?method=reg5"; //重定向 return "redirect:http://www.baidu.com"; //重定向 } @RequestMapping(value = "/reg5") public String reg5(@RequestParam("uname") String uname,ModelMap map) { System.out.println("HelloController.handleRequest()"); System.out.println(uname); return "index"; } }
這樣如果是請求轉發（forward）的話傳值可以用request和modelMap傳遞。